With this information, you can calculate the quantity of feet per second 21 knots is equal to.
¿What is the inverse calculation between 1 foot per second and 21 knots?
Performing the inverse calculation of the relationship between units, we obtain that 1 foot per second is 0.028213514 times 21 knots.
Which is the same to say that 21 knots is 35.444007 feet per second.
Twenty-one knots equals to thirty-five feet per second. *Approximation
A foot per second is zero times twenty-one knots. *Approximation
